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refactor(session): rename the seed boundary to end-seed

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Hypatia May
2026-07-30 15:32:06 +08:00
parent e8f0934bc2
commit 8527137230
44 changed files with 228 additions and 224 deletions
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docs/core-data-structures/session.zh.md
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@@ -92,27 +92,28 @@ interface SessionEventMap {
*/
'request/header': { header: EpochHeader; reason: RequestHeaderReason }
/**
* Log-only durable projection of {@link Session.firstLiveSeq}: everything
* below it was inherited through a constructor seed (resume, fork, or replay)
* and no writer in this lifecycle produced it. Payload is empty — position
* and `time` carry the meaning.
* Marks the end of a constructor seed. Events before it have smaller seq
* values and came from the seed (resume, fork, or replay); this lifecycle
* produced none of them. This log-only event is the durable projection of
* {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
* carry the meaning.
*
* Locate the LAST one rather than reading `firstLiveSeq`: a seed already
* ending in a boundary is not re-marked, so reopening an untouched session
* does not grow its log per pickup.
* Locate the LAST one in stored history. A seed already ending in one is not
* re-marked, so reopening an untouched session does not grow its log per
* pickup and the event need not be at the current `firstLiveSeq`.
*
* `Session`'s constructor is the only legitimate writer. The invariant
* companion deliberately constrains nothing here, so a plugin appending one
* would silently turn every live bracket below it into dead history.
* would silently classify every live bracket before it as seed history.
*
* An owner of a standalone open/close bracket (`compact/start` …
* `compact/end`) reads it because inherited history and live work are
* otherwise byte-identical: an unmatched opening marker below the boundary
* belongs to an ended lifecycle, whatever ended it. NOT a liveness signal
* about other writers — a concurrently live session holds its own boundary
* elsewhere, so tolerating concurrent writers needs a signal beyond the log.
* `compact/end`) reads it because seed history and live work are otherwise
* byte-identical: an unmatched opening marker before this event belongs to
* an ended lifecycle, whatever ended it. NOT a liveness signal about other
* writers — a concurrently live session holds its own boundary elsewhere,
* so tolerating concurrent writers needs a signal beyond the log.
*/
'session/inherited': Record<string, never>
'session/end-seed': Record<string, never>
}
```
@@ -344,25 +345,25 @@ declare class Session {
get id(): SessionId;
/**
* The first seq appended IN THIS PROCESS: the length of the constructor
* seed (0 without one). Events below it entered through construction —
* replay, fork, or resume — and were never published on the `session/event`
* firehose (constructor seeds do not emit), so consumers that replay the
* log as a publication substitute (telemetry adoption) start here. Distinct
* from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
* session's constructor seed is its full stored log, while its header keeps
* the original fork value — this field is the in-process construction fact.
* seed (0 without one). Events with smaller seq values entered through
* construction — replay, fork, or resume — and were never published on the
* `session/event` firehose (constructor seeds do not emit), so consumers
* that replay the log as a publication substitute (telemetry adoption)
* start here. Distinct from `header.seedLength`, the DURABLE fork-lineage
* boundary: a resumed session's constructor seed is its full stored log,
* while its header keeps the original fork value — this field is the
* in-process construction fact.
*
* Not persisted itself: a seeded session projects it into the log as the
* `session/inherited` event, which is what a consumer reading STORED history
* reads. Locate that event as the log's LAST boundary, not at this seq — a
* `session/end-seed` event, which is what a consumer reading STORED history
* reads. Locate the LAST such event, not necessarily one at this seq — a
* seed already ending in one is not re-marked, so reopening an untouched
* session leaves the boundary below `firstLiveSeq`. Prefer this field
* in-process: it is exact before the marker's write reaches storage.
* session leaves that event at a smaller seq than `firstLiveSeq`. Prefer
* this field in-process: it is exact before the marker reaches storage.
*
* When this lifecycle did append a boundary it sits at this seq, appended
* before the store attached, so that event did not publish either — the
* firehose gap then runs through `firstLiveSeq` rather than stopping below
* it. Otherwise this seq holds an ordinary published write.
* When this lifecycle appends the marker, it occupies this seq before the
* store attaches and therefore does not publish either. Otherwise this seq
* holds an ordinary published write.
*/
readonly firstLiveSeq: number;
constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);
@@ -544,13 +545,13 @@ interface TurnEndReasonMap {
可选的 `dsh-session/invariant` 配套插件会强制核心拥有的关系：轮次与步骤编号、执行事件封闭，以及同一步骤内的工具调用／结果配对。可合并扩展事件的关系由声明它的插件拥有，因此核心不会仅因没有开放轮次就拒绝未知事件。见[独立事件决策](../../.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md)。
## 继承历史边界：`session/inherited`
## 种子结束边界：`session/end-seed`
带种子的会话（恢复、fork 或重放）把这个仅日志事件作为自己的第一次实时写入追加。它是 `firstLiveSeq` 的持久投影：该字段为持有对象的消费方回答"我继承了哪一段前缀"，这个事件则为只持有存储字节的消费方回答同一问题。payload 为空，因此位置与 `time` 承载全部含义，且不产生任何消息。`Session` 的构造函数是唯一合法的写入方。
带种子的会话（恢复、fork 或回放）紧接构造种子之后追加这个仅日志事件，作为自己的第一次实时写入。在它之前的事件具有更小的 seq，且来自种子。它是 `firstLiveSeq` 的持久投影：该字段为持有对象的消费方回答本生命周期的写入从哪里开始，该事件则为只持有存储字节的消费方回答同一问题。payload 为空，因此位置与 `time` 承载全部含义，且不产生任何消息。`Session` 的构造函数是唯一合法的写入方。
空种子不写入任何内容；种子本身已以该边界结尾时不会重复标记，因此重新打开一个未被改动的会话不会每次拾起都增长日志。定位边界应取日志中的**最后一条**，而不是读 `firstLiveSeq`：在一次没有产生工作的拾起之后，下一次拾起会让边界落在该 seq 之下。
空种子不写入任何内容；种子本身已以 `session/end-seed` 结尾时不会重复标记，因此重新打开一个未被改动的会话不会每次拾起都增长日志。应定位存储历史中的最后一条 `session/end-seed`，而不是假定 `firstLiveSeq` 处一定有一条：在一次没有产生工作的拾起之后，该事件的 seq 会小于下一个生命周期的 `firstLiveSeq`。
它之所以必要，是因为继承历史与实时工作在字节层面完全相同，这会让任何拥有独立开／闭括号的插件失效：一个未配对的 `compact/start`，无论写入方是在压缩中途崩溃、还是此刻正在压缩，读起来都一样。边界之下的开启标记属于一个已结束的生命周期，无论结束原因为何（崩溃、进程接替，或从仍在运行的父会话 fork 出来），因此其所有方可以视之为已死。这只覆盖*本*会话继承的括号：另一个并发存活的会话可能在同一段历史上持有开放括号，而它自己的边界在别处，因此容忍并发写入方还需要日志之外的存活信号。核心写入该边界但不从中读取任何内容——括号的词汇表仍归其所属插件，这也正是崩溃修复只关闭轮次／步骤／工具边界而从不处理 `compact/*` 的原因。
它之所以必要，是因为种子历史与实时工作在字节层面完全相同，这会让任何拥有独立开／闭括号的插件失效：一个未配对的 `compact/start`，无论写入方是在压缩中途崩溃、还是此刻正在压缩，读起来都一样。在 `session/end-seed` 之前的开启标记来自构造种子，并且属于一个已结束的生命周期，无论结束原因为何（崩溃、进程接替，或从仍在运行的父会话 fork 出来），因此其所有方可以视之为已死。这只覆盖*本*会话继承的括号：另一个并发存活的会话可能在同一段历史上持有开放括号，而它自己的边界在别处，因此容忍并发写入方还需要日志之外的存活信号。核心写入该边界但不从中读取任何内容——括号的词汇表仍归其所属插件，这也正是崩溃修复只关闭轮次／步骤／工具边界而从不处理 `compact/*` 的原因。
活动排序通过 `lastActivityTime(events)` 排除该边界：接手会话不算工作，而惰性恢复意味着浏览就会写入一个，因此按日志尾部排序的恢复选择器或会话列表会把每个打开过的会话顶到最前。